If you thought that the only reason you’ve been seeing so many of those “look back” videos in your Facebook news feed was that Facebook has been bumping their visibility or something–well, that’s not entirely accurate.

Ok, it could be part of it. But according to Sheryl Sandberg, the 1-minute trips down Facebook memory lane that the company debuted earlier this month were actually just super duper popular.

Speaking at the Goldman Sachs Technology and Internet Conference on Tuesday, Sandberg shared some numbers about those ubiquitous videos: Nearly 200 million people watched their own “look back” video and half of those who watched their own video shared it with friends (via CNET).

Take Facebook’s 1.23 billion monthly active users, subtract the 65 million or so fake account that are believed to exist, and you find that over 10% of all Facebook users, worldwide, shared one of those videos on their Timelines.

I think we can call them a hit.

The look back videos were so popular that parodies started popping up – a couple which were truly hilarious.

Well, at least we now know why these things were everywhere for about two weeks – a lot of people took a look back and a lot of people decided that their friends should take that trip with them. Sandberg said it was a success in “showing the power of the Facebook brand.”

Image via YouTube